6.14-简单虚函数.cpp

Visual C++的课件

//Listing 11.8 Using virtual methods

#include <iostream.h>

class Mammal
{
public:
	Mammal():itsAge(1) { cout << "Mammal constructor...\n"; }
	virtual ~Mammal() { cout << "Mammal destructor...\n"; }
	void Move() const { cout << "Mammal move one step\n"; }
	virtual void Speak() const { cout << "Mammal speak!\n"; }
protected:
	int itsAge;

};

class Dog : public Mammal
{
public:
	Dog() { cout << "Dog Constructor...\n"; }
	virtual ~Dog() { cout << "Dog destructor...\n"; }
	void WagTail() { cout << "Wagging Tail...\n"; }
	void Speak()const { cout << "Woof!\n"; }
	void Move()const { cout << "Dog moves 5 steps...\n"; }
};

int main()
{

	Mammal *pDog = new Dog;
	pDog->Move();
	pDog->Speak();

	return 0;
}